Process of mixing concrete and the like.



E. c.v WOODWARD. PROCESS OF MIXlNG CONCRETE AND vTHE LIKE. APPLICATION FILED JULY 25, l9l6 1,21 8,347. I Patented Mar. 6, 1917.

EDWINCWOODWWM 210' as Rls PFTERs'czL, WASHINGTON, n. c,

EDWIN C. WOODWABD, 0F DALLAS, TEXAS.

PROCESS OF MIXING CONCRETE AND THE LIKE.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed July 25, 1916. Serial No. 111,168.

To all whom it may concern:

Be it known that I, EDWIN C. WOODWARD, a citizen of the United States, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Processes of Mixing Concrete and the like, of which the following is a specification.

My invention relates to a process of mixing concrete and similar mixtures of plastic composition, and the object is to produce a more dense and stronger concrete by effecting a more perfect hydration of the materials in process of being mixed and the elimination of air pockets.

In mixing concrete under normal atmospheric conditions and in the presence of large quantities of air, the resulting mixture has contained large quantities of air through the aeration processes heretofore present in other methods. The presence of myriads of globules of air has tended to segregate the water from the cementitious material there by preventing the hydration to the fullest extent, and also resulting in a finished product honeycombed with air pockets.

The drawing shows a'mixer A of ordinary type, being adapted to receive the material in upright position and to be tilted for discharging the material. The operat- I ing mechanism of the mixer is not shown. A flexible steel steam pipe B is shown connected to the bottom of the mixer for introducing steam, such pipe being necessary on account of the changing positions of the mixer.

- When the mixer is brought to upright position, steam is turned into the bottom of the mixer which operation expels all the air. Material is then poured into the mixer While the introduction of steam continues. The materials are mixed in the usual manner by revolving or rotating devices Within the mixing receptacle while the introduction of steam continues. After the materials are sufficiently mixed, the mixing receptacle is tilted in the usual manner While the introduction of steam continues,until the material or mixed concrete is discharged. Steam Copies of this patent may be obtained for five cents each, by addressing the are being poured or fed into the vessel or receptacle. In other words, the ingredients I are poured into normal or superheated steam and the ingredients are mixed in the steam by the mixing devices rotating in the mixer and discharged from the steam. The air is kept excluded by the steam. By such processthe voids in the formed material will be reduced to a minimum. The air being exhausted and kept exhausted, the process of hydration is not interfered with or hindered by the presence of air but will be aided and accelerated by the heat from the steam, thus quickening the process of hydration which will add to the early and permanent tensile strength of the formed material. Steam is supplied to the vessel before the pouring of the ingredients into the vessel or mixer and the steam is continually supplied to the vessel or mixer during the mixing process.

This process is useful in mixing cementitious material with an aggregate or a combination of aggregates or for making plastic compositions for concrete or artificial stone.

What I claim, is,

The process of forming concrete, consisting of first excluding the air from a receptacle adapted to contain the materials to be mixed by the introduction thereto of steam, then pouring into said volume of steam the materials to be mixed, and mixing said materials while at the same time maintaining the steam supply therein.

In testimony whereof, I set my hand, this 12th day of July, 1916.

EDWIN o. woonwaan Commissioner of Patents,

Washington, D. G. 

